<template>
  <div class="cart">
    <Header/>
    <div class="cart-info">
        <h3 class="cart-top">购物车结算 <span>共{{course_list.length}}门课程</span></h3>
        <div class="cart-title">
           <el-row>
             <el-col :span="2">&nbsp;</el-col>
             <el-col :span="10">课程</el-col>
             <el-col :span="8">有效期</el-col>
             <el-col :span="4">价格</el-col>
           </el-row>
        </div>
        <div class="cart-item" v-for="course in course_list">
          <el-row>
             <el-col :span="2" class="checkbox">&nbsp;&nbsp;</el-col>
             <el-col :span="10" class="course-info">
               <img :src="course.course_img" alt="">
               <span class="course_name">{{course.name}}<br><span class="discount">{{course.discount_name}}</span></span>
             </el-col>
             <el-col :span="8"><span>{{course.expire_text}}</span></el-col>
             <el-col :span="4" class="course-price">
               <span class="real_price">¥{{course.real_price}}</span><br>
               <span class="original_price">原价¥{{course.original_price}}</span>
             </el-col>
           </el-row>
        </div>

        <div class="discount">
          <div id="accordion">
            <div class="coupon-box">
              <div class="icon-box">
                <span class="select-coupon">使用优惠劵：</span>
                <a class="select-icon unselect" :class="use_coupon?'is_selected':''" @click="use_coupon=!use_coupon"><img class="sign is_show_select" src="../../static/image/12.png" alt=""></a>
                <span class="coupon-num">有{{coupon_list.length}}张可用</span>
              </div>
              <p class="sum-price-wrap">商品总金额：<span class="sum-price">¥ {{total_price.toFixed(2)}}元</span></p>
            </div>
            <div id="collapseOne" v-if="use_coupon">
              <ul class="coupon-list" v-if="coupon_list.length>0">
                <li class="coupon-item" :class="selected_coupon(key,item.id)" v-for="(item,key) in coupon_list" @click="click_select_coupon(key,item.id)">
                  <p class="coupon-name">{{item.coupon.name}}</p>
                  <p class="coupon-condition" v-if="item.coupon.condition>0">满{{item.coupon.condition}}元可以使用</p>
                  <p class="coupon-condition" v-else>没有使用条件</p>
                  <p class="coupon-time start_time">开始时间：{{item.start_time.replace("T"," ")}}</p>
                  <p class="coupon-time end_time">过期时间：{{item.end_time}}</p>
                </li>
              </ul>
              <div class="no-coupon" v-if="coupon_list.length<1">
                <span class="no-coupon-tips">暂无可用优惠券</span>
              </div>
            </div>
          </div>
          <div class="credit-box">
            <label class="my_el_check_box"><el-checkbox class="my_el_checkbox" v-model="use_credit"></el-checkbox></label>
            <p class="discount-num1" v-if="!use_credit">使用我的贝里</p>
            <p class="discount-num2" v-else><span>总积分：{{user_credit}}，抵扣 <el-input-number @change="handleChange"  v-model="credit" :min="0" :max="max_credit()" label="请填写积分"></el-input-number>，本次花费以后，剩余{{parseInt(user_credit-credit)}}积分</span></p>
          </div>
        </div>

        <div class="calc">
            <el-row class="pay-row">
              <el-col :span="4" class="pay-col"><span class="pay-text">支付方式：</span></el-col>
              <el-col :span="8">
                <span class="alipay" v-if="pay_type==0"><img src="../../static/image/alipay2.png" alt=""></span>
                <span class="alipay" @click="pay_type=0" v-else><img src="../../static/image/alipay.png" alt=""></span>
                <span class="alipay wechat" v-if="pay_type==1"><img src="../../static/image/wechat2.png" alt=""></span>
                <span class="alipay wechat" @click="pay_type=1" v-else><img src="../../static/image/wechat.png" alt=""></span>
              </el-col>
              <el-col :span="8" class="count">实付款： <span>¥{{(real_total - credit / credit_to_money ).toFixed(2)}}</span></el-col>
              <el-col :span="4" class="cart-pay"><span @click="payHander">立即支付</span></el-col>
            </el-row>
        </div>
    </div>
    <Footer/>
  </div>
</template>

<script>
  import Header from "./common/Header"
  import Footer from "./common/Footer"
  export default {
    name:"Order",
    data(){
      return {
        pay_type: 0,
        course_list: [],
        total_price: 0,     // 结算总价格
        real_total: 0,      // 经过优惠券折算或者积分折算后的总价格
        coupon_list:[],     // 当前用户拥有的优惠券列表

        use_credit: false,  // 是否使用了积分
        use_coupon: false,  // 是否使用了优惠券
        credit: 0,          // 积分
        coupon: 0,          // 优惠券ID，0表示没有使用优惠券
        user_credit: localStorage.user_credit || sessionStorage.user_credit,
        credit_to_money: localStorage.credit_to_money || sessionStorage.credit_to_money,
      }
    },
    components:{
      Header,
      Footer,
    },
    created(){
      this.token = this.check_user_login();
      this.get_cart();
      this.get_coupon();
    },
    watch:{
        coupon(){
          this.credit = 0;
          this.calc_real_total();
        },
        use_coupon(){
          if(this.use_coupon === false){
              this.coupon = 0;
              this.real_total = this.total_price;
          }
        }
    },
    methods: {
      check_user_login(){
        let token = localStorage.user_token || sessionStorage.user_token;
        if( !token ){
            let self = this;
            this.$confirm("对不起，您尚未登录！所以请登录再使用购物车","路飞学城",{
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                self.$router.push("/user/login");
            });
            return false; // 阻止js继续往下执行
        }
        return token;
      },
      get_cart(){
          // 获取购物车中要结算的商品列表
          this.$axios.get(`${this.$settings.HOST}/cart/order/`,{
              headers:{
                  "Authorization": "jwt " + this.token,
              }
          }).then(response=>{
              this.course_list = response.data.course_list;
              this.total_price = response.data.total_price;
              this.real_total = response.data.total_price;
          }).catch(error=>{
              this.$message.error("对不起，当前购物车没有任何商品被勾选！");
          });
      },
      get_coupon(){
        // 获取当前用户拥有的优惠券
          this.$axios.get(`${this.$settings.HOST}/coupon/`,{
              headers:{
                  "Authorization": "jwt " + this.token,
              }
          }).then(response=>{
              this.coupon_list = response.data;
          }).catch(error=>{
              this.$message.error("对不起，当前购物车没有任何商品被勾选！");
          });
      },
      selected_coupon(key, user_coupon_id){
          // 当选中优惠券时，切换优惠券的高亮显示效果
          let user_coupon = this.coupon_list[key];
          // 判断总价格是否满足优惠券的使用
          if( this.total_price < user_coupon.coupon.condition ){
              return "disable";
          }
          // 判断优惠券是否处于使用时间范围内
          let start_timestamp = parseInt(new Date(user_coupon.start_time) / 1000);
          let end_timestamp = parseInt(new Date(user_coupon.end_time) / 1000);
          let now_timestamp = parseInt(new Date() / 1000);
          if( (now_timestamp < start_timestamp) || (now_timestamp > end_timestamp) ){
              return "disable";
          }

          if( this.coupon === user_coupon_id ){
              return "active";
          }

          return "";
      },
      click_select_coupon(key, user_coupon_id){
          // 点击切换优惠券时记录本次点击的优惠券
          let user_coupon = this.coupon_list[key];
          if( this.total_price < user_coupon.coupon.condition ){
              return false;
          }

          let start_timestamp = parseInt(new Date(user_coupon.start_time) / 1000);
          let end_timestamp = parseInt(new Date(user_coupon.end_time) / 1000);
          let now_timestamp = parseInt(new Date() / 1000);
          if( (now_timestamp < start_timestamp) || (now_timestamp > end_timestamp) ){
              return false;
          }
          this.coupon = user_coupon_id;

      },
      payHander(){
          // 生成订单
          this.$axios.post(`${this.$settings.HOST}/order/`,{
              pay_type: this.pay_type,  // 支付方式
              credit: this.credit,      // 积分
              coupon: this.coupon,      // 优惠券ID
          },{
              headers:{
                  "Authorization": "jwt " + this.token,
              }
          }).then(response=>{
              // 订单生成成功！
              this.$message.success("订单生成成功！即将跳转到支付页面，请不要眨眼！");
              // 发起支付[页面跳转,后端需要提供跳转地址]
              this.$axios.get(`${this.$settings.HOST}/payments/alipay/`,{
                  params:{
                      order_number: response.data.order_number,
                  }
              }).then(response=>{
                  // 返回支付链接地址
                  location.href=response.data;

              }).catch(error=>{
                  this.$message.error(error.response.data.message);
              })
          }).catch(error=>{
              this.$message.error("订单生成失败！");
          })
      },
      calc_real_total(){
          this.coupon_list.forEach((item)=>{
              // 选出当前选中的那一张优惠券
              if(item.id === this.coupon){
                  let start_timestamp = parseInt(new Date(item.start_time) / 1000);
                  let end_timestamp = parseInt(new Date(item.end_time) / 1000);
                  let now_timestamp = parseInt(new Date() / 1000);
                  // 选出当前可以使用的优惠券
                  if( (this.total_price > item.coupon.condition) && (now_timestamp > start_timestamp) && (now_timestamp < end_timestamp) ){
                    // 获取优惠公式
                    let f = parseFloat( item.coupon.sale.substr(1) );
                    // 根据优惠公式计算最终折算后的总价格
                    if( item.coupon.sale[0] === "*" ){
                        // 折扣优惠
                        this.real_total = this.total_price * f;
                    }else{
                        // 减免优惠
                        this.real_total = this.total_price - f;
                    }
                  }
              }
          });
      },
      max_credit(){
        // 计算本次订单中，用户可以设置的最大积分

        // 用户拥有的积分允许抵扣的最大金额
        let max_credit_to_money = this.user_credit / this.credit_to_money;
        console.log( "用户积分抵扣",max_credit_to_money );
        // 计算当前真实的订单实付金额
        let ret = 0;
        if(max_credit_to_money > this.real_total){
            ret = parseInt(this.real_total * this.credit_to_money);
        }else{
            ret = parseInt(this.user_credit);
        }
        console.log(ret);
        return ret;

      },
      handleChange(value){
        if(!value){
            this.credit = 0;
        }
      }
    },
  }
</script>

<style scoped>
.cart{
  margin-top: 80px;
}
.cart-info{
  overflow: hidden;
  width: 1200px;
  margin: auto;
}
.cart-top{
  font-size: 18px;
  color: #666;
  margin: 25px 0;
  font-weight: normal;
}
.cart-top span{
    font-size: 12px;
    color: #d0d0d0;
    display: inline-block;
}
.cart-title{
    background: #F7F7F7;
    height: 70px;
}
.calc{
  margin-top: 25px;
  margin-bottom: 40px;
}

.calc .count{
  text-align: right;
  margin-right: 10px;
  vertical-align: middle;
}
.calc .count span{
    font-size: 36px;
    color: #333;
}
.calc .cart-pay{
    margin-top: 5px;
    width: 110px;
    height: 38px;
    outline: none;
    border: none;
    color: #fff;
    line-height: 38px;
    background: #ffc210;
    border-radius: 4px;
    font-size: 16px;
    text-align: center;
    cursor: pointer;
}
.cart-item{
  height: 120px;
  line-height: 120px;
  margin-bottom: 30px;
}
.course-info img{
    width: 175px;
    height: 115px;
    margin-right: 35px;
    vertical-align: middle;
}
.alipay{
  display: inline-block;
  height: 48px;
}
.alipay img{
  height: 100%;
  width:auto;
}

.pay-text{
  display: block;
  text-align: right;
  height: 100%;
  line-height: 100%;
  vertical-align: middle;
  margin-top: 20px;
}
.course_name,.real_price,.original_price{
  display: inline-block;
  line-height: 140%;
}
.course_name .discount{
  color: #ffc210;
}

.original_price{
  color: #9b9b9b;
}
.course-price{
  line-height: 32px;
}


/** 优惠券 **/
.coupon-box{
  text-align: left;
  padding-bottom: 22px;
  padding-left:30px;
  border-bottom: 1px solid #e8e8e8;
}
.coupon-box::after{
  content: "";
  display: block;
  clear: both;
}
.icon-box{
  float: left;
}
.icon-box .select-coupon{
  float: left;
  color: #666;
  font-size: 16px;
}
.icon-box::after{
  content:"";
  clear:both;
  display: block;
}
.select-icon{
  width: 20px;
  height: 20px;
  float: left;
}
.select-icon img{
  max-height:100%;
  max-width: 100%;
  margin-top: 2px;
  transform: rotate(-90deg);
  transition: transform .5s;
}
.is_show_select{
  transform: rotate(0deg)!important;
}
.coupon-num{
    height: 22px;
    line-height: 22px;
    padding: 0 5px;
    text-align: center;
    font-size: 12px;
    float: left;
    color: #fff;
    letter-spacing: .27px;
    background: #fa6240;
    border-radius: 2px;
    margin-left: 20px;
}
.sum-price-wrap{
    float: right;
    font-size: 16px;
    color: #4a4a4a;
    margin-right: 45px;
}
.sum-price-wrap .sum-price{
  font-size: 18px;
  color: #fa6240;
}

.no-coupon{
  text-align: center;
  width: 100%;
  padding: 50px 0px;
  align-items: center;
  justify-content: center; /* 文本两端对其 */
  border-bottom: 1px solid rgb(232, 232, 232);
}
.no-coupon-tips{
  font-size: 16px;
  color: #9b9b9b;
}
.credit-box{
  height: 30px;
  margin-top: 40px;
  display: flex;
  align-items: center;
  justify-content: flex-end
}
.my_el_check_box{
  position: relative;
}
.my_el_checkbox{
  margin-right: 10px;
  width: 16px;
  height: 16px;
}
.discount{
  overflow: hidden;
}
.discount-num1{
  color: #9b9b9b;
  font-size: 16px;
  margin-right: 45px;
}
.discount-num2{
  margin-right: 45px;
  font-size: 16px;
  color: #4a4a4a;
}
.sun-coupon-num{
  margin-right: 45px;
  margin-bottom:43px;
  margin-top: 40px;
  font-size: 16px;
  color: #4a4a4a;
  display: inline-block;
  float: right;
}
.sun-coupon-num span{
  font-size: 18px;
  color: #fa6240;
}
.coupon-list{
  margin: 20px 0;
}
.coupon-list::after{
  display: block;
  content:"";
  clear: both;
}
.coupon-item{
  float: left;
  margin: 15px 8px;
  width: 180px;
  height: 100px;
  padding: 5px;
  background-color: #fa3030;
  cursor: pointer;
}
.coupon-list .active{
  background-color: #fa9000;
}
.coupon-list .disable{
  cursor: not-allowed;
  background-color: #fa6060;
}
.coupon-condition{
  font-size: 12px;
  text-align: center;
  color: #fff;
}
.coupon-name{
  color: #fff;
  font-size: 24px;
  text-align: center;
}
.coupon-time{
  text-align: left;
  color: #fff;
  font-size: 12px;
}
.unselect{
  margin-left: 0px;
  transform: rotate(-90deg);
}
.is_selected{
  transform: rotate(-1turn)!important;
}
</style>
